/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013-2015 Damien P. George
 * Copyright (c) 2016 Paul Sokolovsky
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <stdint.h>
#include <stdio.h>

#include "py/obj.h"
#include "py/runtime.h"
#include "shared/runtime/pyexec.h"

#include "machine.h"


// This needs to be set before we include the RTOS headers
//#define USE_US_TIMER 1

//#include "extmod/machine_bitstream.h"
#include "extmod/machine_mem.h"
#include "extmod/machine_spi.h"

//#include "extmod/machine_signal.h"
//#include "extmod/machine_pulse.h"
//#include "extmod/machine_pwm.h"
//#include "extmod/machine_i2c.h"

//#include "modmachine.h"


#if MICROPY_PY_MACHINE

// #define MACHINE_WAKE_IDLE (0x01)
// #define MACHINE_WAKE_SLEEP (0x02)
//#define MACHINE_WAKE_DEEPSLEEP (0x04)

//extern const mp_obj_type_t esp_wdt_type;



STATIC mp_obj_t machine_freq(size_t n_args, const mp_obj_t *args) {
    if (n_args == 0) {
        // get
        return mp_obj_new_int(480 * 1000000 / (READ_REG(RCC->CLK_DIV) & 0xFF)); // RCC->CLK_DIV第8位存储CPU预分频值, 480Mhz/分频值为对应频率
    } else {
        // set
        mp_int_t freq = mp_obj_get_int(args[0]) / 1000000;  // MHz
        if(freq < 2 || freq > 240){
            mp_raise_ValueError(MP_ERROR_TEXT("frequency range 2MHz ~ 240MHz"));
        }
        SystemClock_Config(480 / freq);
		return mp_const_none;
    }
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_freq_obj, 0, 1, machine_freq);

extern int HAL_FLASH_ReadID(uint8_t *uuid, uint8_t len);

STATIC mp_obj_t machine_unique_id(void) {
    uint8_t uuid[20] = {0};
    int len = HAL_FLASH_ReadID(uuid, sizeof(uuid));
    return mp_obj_new_bytes((byte *)uuid, len);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_unique_id_obj, machine_unique_id);


STATIC mp_obj_t machine_reset(void) {
    NVIC_SystemReset();
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_obj, machine_reset);

// STATIC mp_obj_t machine_soft_reset(void) {
//     pyexec_system_exit = PYEXEC_FORCED_EXIT;
//     mp_raise_type(&mp_type_SystemExit);
// }
// STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_soft_reset_obj, machine_soft_reset);

// STATIC mp_obj_t machine_reset_cause(void) {
//     return MP_OBJ_NEW_SMALL_INT(system_get_rst_info()->reason);
// }
// STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_reset_cause_obj, machine_reset_cause);


// STATIC mp_obj_t machine_idle(void) {
//     uint32_t t = mp_hal_ticks_cpu();
//     asm ("waiti 0");
//     t = mp_hal_ticks_cpu() - t;
//     ets_event_poll(); // handle any events after possibly a long wait (eg feed WDT)
//     return MP_OBJ_NEW_SMALL_INT(t);
// }
// STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_idle_obj, machine_idle);

// STATIC mp_obj_t machine_lightsleep(size_t n_args, const mp_obj_t *args) {
//     uint32_t max_us = 0xffffffff;
//     if (n_args == 1) {
//         mp_int_t max_ms = mp_obj_get_int(args[0]);
//         if (max_ms < 0) {
//             max_ms = 0;
//         }
//         max_us = max_ms * 1000;
//     }
//     uint32_t wifi_mode = wifi_get_opmode();
//     uint32_t start = system_get_time();
//     while (system_get_time() - start <= max_us) {
//         ets_event_poll();
//         if (wifi_mode == NULL_MODE) {
//             // Can only idle if the wifi is off
//             asm ("waiti 0");
//         }
//     }
//     return mp_const_none;
// }
// STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_lightsleep_obj, 0, 1, machine_lightsleep);

// STATIC mp_obj_t machine_deepsleep(size_t n_args, const mp_obj_t *args) {
//     // default to sleep forever
//     uint32_t sleep_us = 0;

//     // see if RTC.ALARM0 should wake the device
//     if (pyb_rtc_alarm0_wake & MACHINE_WAKE_DEEPSLEEP) {
//         uint64_t t = pyb_rtc_get_us_since_epoch();
//         if (pyb_rtc_alarm0_expiry <= t) {
//             sleep_us = 1; // alarm already expired so wake immediately
//         } else {
//             uint64_t delta = pyb_rtc_alarm0_expiry - t;
//             if (delta <= 0xffffffff) {
//                 // sleep for the desired time
//                 sleep_us = delta;
//             } else {
//                 // overflow, just set to maximum sleep time
//                 sleep_us = 0xffffffff;
//             }
//         }
//     }

//     // if an argument is given then that's the maximum time to sleep for
//     if (n_args == 1) {
//         mp_int_t max_ms = mp_obj_get_int(args[0]);
//         if (max_ms <= 0) {
//             max_ms = 1;
//         }
//         uint32_t max_us = max_ms * 1000;
//         if (sleep_us == 0 || max_us < sleep_us) {
//             sleep_us = max_us;
//         }
//     }

//     // prepare for RTC reset at wake up
//     rtc_prepare_deepsleep(sleep_us);
//     // put the device in a deep-sleep state
//     system_deep_sleep_set_option(0); // default power down mode; TODO check this
//     system_deep_sleep(sleep_us);

//     for (;;) {
//         // we must not return
//         ets_loop_iter();
//     }

//     return mp_const_none;
// }
// STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(machine_deepsleep_obj, 0, 1, machine_deepsleep);

// // These values are from the datasheet
// #define ESP_TIMER_US_MIN (100)
// #define ESP_TIMER_US_MAX (0xfffffff)
// #define ESP_TIMER_MS_MAX (0x689d0)

// typedef struct _esp_timer_obj_t {
//     mp_obj_base_t base;
//     os_timer_t timer;
//     uint32_t remain_ms; // if non-zero, remaining time to handle large periods
//     uint32_t period_ms; // if non-zero, periodic timer with a large period
//     mp_obj_t callback;
// } esp_timer_obj_t;

// STATIC void esp_timer_arm_ms(esp_timer_obj_t *self, uint32_t ms, bool repeat) {
//     if (ms <= ESP_TIMER_MS_MAX) {
//         self->remain_ms = 0;
//         self->period_ms = 0;
//     } else {
//         self->remain_ms = ms - ESP_TIMER_MS_MAX;
//         if (repeat) {
//             repeat = false;
//             self->period_ms = ms;
//         } else {
//             self->period_ms = 0;
//         }
//         ms = ESP_TIMER_MS_MAX;
//     }
//     os_timer_arm(&self->timer, ms, repeat);
// }

// STATIC void esp_timer_arm_us(esp_timer_obj_t *self, uint32_t us, bool repeat) {
//     if (us < ESP_TIMER_US_MIN) {
//         us = ESP_TIMER_US_MIN;
//     }
//     if (us <= ESP_TIMER_US_MAX) {
//         self->remain_ms = 0;
//         self->period_ms = 0;
//         os_timer_arm_us(&self->timer, us, repeat);
//     } else {
//         esp_timer_arm_ms(self, us / 1000, repeat);
//     }
// }

// const mp_obj_type_t esp_timer_type;

// STATIC void esp_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
//     esp_timer_obj_t *self = self_in;
//     mp_printf(print, "Timer(%p)", &self->timer);
// }

// STATIC mp_obj_t esp_timer_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
//     mp_arg_check_num(n_args, n_kw, 1, 1, false);
//     esp_timer_obj_t *tim = m_new_obj(esp_timer_obj_t);
//     tim->base.type = &esp_timer_type;
//     return tim;
// }

// STATIC void esp_timer_cb(void *arg) {
//     esp_timer_obj_t *self = arg;
//     if (self->remain_ms != 0) {
//         // Handle periods larger than the maximum system period
//         uint32_t next_period_ms = self->remain_ms;
//         if (next_period_ms > ESP_TIMER_MS_MAX) {
//             next_period_ms = ESP_TIMER_MS_MAX;
//         }
//         self->remain_ms -= next_period_ms;
//         os_timer_arm(&self->timer, next_period_ms, false);
//     } else {
//         mp_sched_schedule(self->callback, self);
//         if (self->period_ms != 0) {
//             // A periodic timer with a larger period: reschedule it
//             esp_timer_arm_ms(self, self->period_ms, true);
//         }
//     }
// }

// STATIC mp_obj_t esp_timer_init_helper(esp_timer_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
//     enum {
//         ARG_mode,
//         ARG_callback,
//         ARG_period,
//         ARG_tick_hz,
//         ARG_freq,
//     };
//     static const mp_arg_t allowed_args[] = {
//         { MP_QSTR_mode,         MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
//         { MP_QSTR_callback,     MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
//         { MP_QSTR_period,       MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0xffffffff} },
//         { MP_QSTR_tick_hz,      MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000} },
//         #if MICROPY_PY_BUILTINS_FLOAT
//         { MP_QSTR_freq,         MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
//         #else
//         { MP_QSTR_freq,         MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0xffffffff} },
//         #endif
//     };

//     // parse args
//     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
//     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

//     self->callback = args[ARG_callback].u_obj;
//     // Be sure to disarm timer before making any changes
//     os_timer_disarm(&self->timer);
//     os_timer_setfn(&self->timer, esp_timer_cb, self);

//     #if MICROPY_PY_BUILTINS_FLOAT
//     if (args[ARG_freq].u_obj != mp_const_none) {
//         mp_float_t freq = mp_obj_get_float(args[ARG_freq].u_obj);
//         if (freq < 0.001) {
//             esp_timer_arm_ms(self, (mp_int_t)(1000 / freq), args[ARG_mode].u_int);
//         } else {
//             esp_timer_arm_us(self, (mp_int_t)(1000000 / freq), args[ARG_mode].u_int);
//         }
//     }
//     #else
//     if (args[ARG_freq].u_int != 0xffffffff) {
//         esp_timer_arm_us(self, 1000000 / args[ARG_freq].u_int, args[ARG_mode].u_int);
//     }
//     #endif
//     else {
//         mp_int_t period = args[ARG_period].u_int;
//         mp_int_t hz = args[ARG_tick_hz].u_int;
//         if (hz == 1000) {
//             esp_timer_arm_ms(self, period, args[ARG_mode].u_int);
//         } else if (hz == 1000000) {
//             esp_timer_arm_us(self, period, args[ARG_mode].u_int);
//         } else {
//             // Use a long long to ensure that we don't either overflow or loose accuracy
//             uint64_t period_us = (((uint64_t)period) * 1000000) / hz;
//             if (period_us < 0x80000000ull) {
//                 esp_timer_arm_us(self, (mp_int_t)period_us, args[ARG_mode].u_int);
//             } else {
//                 esp_timer_arm_ms(self, (mp_int_t)(period_us / 1000), args[ARG_mode].u_int);
//             }
//         }
//     }

//     return mp_const_none;
// }

// STATIC mp_obj_t esp_timer_init(size_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
//     return esp_timer_init_helper(args[0], n_args - 1, args + 1, kw_args);
// }
// STATIC MP_DEFINE_CONST_FUN_OBJ_KW(esp_timer_init_obj, 1, esp_timer_init);

// STATIC mp_obj_t esp_timer_deinit(mp_obj_t self_in) {
//     esp_timer_obj_t *self = self_in;
//     os_timer_disarm(&self->timer);
//     return mp_const_none;
// }
// STATIC MP_DEFINE_CONST_FUN_OBJ_1(esp_timer_deinit_obj, esp_timer_deinit);

// STATIC const mp_rom_map_elem_t esp_timer_locals_dict_table[] = {
//     { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&esp_timer_deinit_obj) },
//     { MP_ROM_QSTR(MP_QSTR_init), MP_ROM_PTR(&esp_timer_init_obj) },
// //    { MP_ROM_QSTR(MP_QSTR_callback), MP_ROM_PTR(&esp_timer_callback_obj) },
//     { MP_ROM_QSTR(MP_QSTR_ONE_SHOT), MP_ROM_INT(false) },
//     { MP_ROM_QSTR(MP_QSTR_PERIODIC), MP_ROM_INT(true) },
// };
// STATIC MP_DEFINE_CONST_DICT(esp_timer_locals_dict, esp_timer_locals_dict_table);

// const mp_obj_type_t esp_timer_type = {
//     { &mp_type_type },
//     .name = MP_QSTR_Timer,
//     .print = esp_timer_print,
//     .make_new = esp_timer_make_new,
//     .locals_dict = (mp_obj_dict_t *)&esp_timer_locals_dict,
// };

STATIC mp_obj_t machine_disable_irq(void) {
    __disable_irq();
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_disable_irq_obj, machine_disable_irq);

STATIC mp_obj_t machine_enable_irq(void) {
    __enable_irq();
    return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(machine_enable_irq_obj, machine_enable_irq);


// // Custom version of this function that feeds system WDT if necessary
// mp_uint_t machine_time_pulse_us(mp_hal_pin_obj_t pin, int pulse_level, mp_uint_t timeout_us) {
//     int nchanges = 2;
//     uint32_t start = system_get_time(); // in microseconds
//     for (;;) {
//         uint32_t dt = system_get_time() - start;

//         // Check if pin changed to wanted value
//         if (mp_hal_pin_read(pin) == pulse_level) {
//             if (--nchanges == 0) {
//                 return dt;
//             }
//             pulse_level = 1 - pulse_level;
//             start = system_get_time();
//             continue;
//         }

//         // Check for timeout
//         if (dt >= timeout_us) {
//             return (mp_uint_t)-nchanges;
//         }

//         // Only feed WDT every now and then, to make sure edge timing is accurate
//         if ((dt & 0xffff) == 0xffff && !ets_loop_dont_feed_sw_wdt) {
//             system_soft_wdt_feed();
//         }
//     }
// }

STATIC const mp_rom_map_elem_t machine_module_globals_table[] = {
    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_umachine) },
    { MP_ROM_QSTR(MP_QSTR_freq), MP_ROM_PTR(&machine_freq_obj) },
    { MP_ROM_QSTR(MP_QSTR_unique_id), MP_ROM_PTR(&machine_unique_id_obj) },
    { MP_ROM_QSTR(MP_QSTR_mem8), MP_ROM_PTR(&machine_mem8_obj) },
    { MP_ROM_QSTR(MP_QSTR_mem16), MP_ROM_PTR(&machine_mem16_obj) },
    { MP_ROM_QSTR(MP_QSTR_mem32), MP_ROM_PTR(&machine_mem32_obj) },

    { MP_ROM_QSTR(MP_QSTR_reset), MP_ROM_PTR(&machine_reset_obj) },
    //{ MP_ROM_QSTR(MP_QSTR_soft_reset), MP_ROM_PTR(&machine_soft_reset_obj) },
    //{ MP_ROM_QSTR(MP_QSTR_reset_cause), MP_ROM_PTR(&machine_reset_cause_obj) },
    //{ MP_ROM_QSTR(MP_QSTR_idle), MP_ROM_PTR(&machine_idle_obj) },
    //{ MP_ROM_QSTR(MP_QSTR_sleep), MP_ROM_PTR(&machine_lightsleep_obj) },
    //{ MP_ROM_QSTR(MP_QSTR_lightsleep), MP_ROM_PTR(&machine_lightsleep_obj) },
    //{ MP_ROM_QSTR(MP_QSTR_deepsleep), MP_ROM_PTR(&machine_deepsleep_obj) },

    { MP_ROM_QSTR(MP_QSTR_disable_irq), MP_ROM_PTR(&machine_disable_irq_obj) },
    { MP_ROM_QSTR(MP_QSTR_enable_irq), MP_ROM_PTR(&machine_enable_irq_obj) },

    #if MICROPY_PY_MACHINE_BITSTREAM
    { MP_ROM_QSTR(MP_QSTR_bitstream), MP_ROM_PTR(&machine_bitstream_obj) },
    #endif

    //{ MP_ROM_QSTR(MP_QSTR_WDT), MP_ROM_PTR(&esp_wdt_type) },
    //{ MP_ROM_QSTR(MP_QSTR_Signal), MP_ROM_PTR(&machine_signal_type) },
    //{ MP_ROM_QSTR(MP_QSTR_ADC), MP_ROM_PTR(&machine_adc_type) },
    #if MICROPY_PY_MACHINE_I2C
    //{ MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&mp_machine_soft_i2c_type) },
    //{ MP_ROM_QSTR(MP_QSTR_SoftI2C), MP_ROM_PTR(&mp_machine_soft_i2c_type) },
    #endif
    #if MICROPY_PY_MACHINE_SPI
    { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&machine_lspi_type) },
    { MP_ROM_QSTR(MP_QSTR_SoftSPI), MP_ROM_PTR(&mp_machine_soft_spi_type) },
    #endif

    // wake abilities
    //{ MP_ROM_QSTR(MP_QSTR_DEEPSLEEP), MP_ROM_INT(MACHINE_WAKE_DEEPSLEEP) },

    // reset causes
    //{ MP_ROM_QSTR(MP_QSTR_PWRON_RESET), MP_ROM_INT(REASON_DEFAULT_RST) },
    //{ MP_ROM_QSTR(MP_QSTR_HARD_RESET), MP_ROM_INT(REASON_EXT_SYS_RST) },
    //{ MP_ROM_QSTR(MP_QSTR_DEEPSLEEP_RESET), MP_ROM_INT(REASON_DEEP_SLEEP_AWAKE) },
    //{ MP_ROM_QSTR(MP_QSTR_WDT_RESET), MP_ROM_INT(REASON_WDT_RST) },
    //{ MP_ROM_QSTR(MP_QSTR_SOFT_RESET), MP_ROM_INT(REASON_SOFT_RESTART) },
	
    { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&pyb_uart_type) },
    { MP_ROM_QSTR(MP_QSTR_Timer), MP_ROM_PTR(&machine_timer_type) },
    { MP_ROM_QSTR(MP_QSTR_PWM), MP_ROM_PTR(&machine_pwm_type) },
    { MP_ROM_QSTR(MP_QSTR_RTC), MP_ROM_PTR(&machine_rtc_type) },
    { MP_ROM_QSTR(MP_QSTR_Pin), MP_ROM_PTR(&machine_pin_type) },
};

STATIC MP_DEFINE_CONST_DICT(machine_module_globals, machine_module_globals_table);

const mp_obj_module_t mp_module_machine = {
    .base = { &mp_type_module },
    .globals = (mp_obj_dict_t *)&machine_module_globals,
};

#endif // MICROPY_PY_MACHINE
